Swimming activity is stored in Fenix 6s watch, but, not syncing to garmin connect.
Swimming activity is stored in Fenix 6s watch, but, not syncing to garmin connect.
Try a manual upload to Garmin Connect Web - How Do I Manually Upload an Activity I Recorded to Garmin Connect?
If you get any message other than Import Complete, then there is a problem with the file. Attach it to this thread. We can take a look to see if it is repairable.